SET ROLE for running migrations

Hi, apologies if this has been asked before or if I missed this in the docs - I’m using postgres and I would like to have my migrations run not as the user liquibase is connecting to the DB as, but as a member of a group the liquibase user is part of. This can be accomplished by running SET ROLE [groupname] before executing migrations, so I can get the benefits of preconfigured default permissions on DB objects. Is there a hook that I can use to execute this or otherwise set the execution role?